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My P-3a dac is quite hot. I don't think it is saft to leave it on continusly. I sent an email to the tech support at PT but no reply.
I open the dac up and find that it is the voltage regulator with heat sink that is hot. It is so hot I could barely touch the heat sink.
Does anybody have this experience. Is there some ways to prevent this, may be change to a better voltage regulator (I believe it is 78m05)
TIA
..chuck
Follow Ups:
Something does seem odd. The unit does run a bit warm as the op-amps are biassed into class A. Mine will feel warm to the touch and I leave it on all of the time. It does not run HOT however. What you are describing does not sound right. I have seen quite a few of these units and have never found one to run HOT as you say.P.T.'s technical support will be very helpful if you call them. Phone calls are often much more effective than e-mails as we all get buried in e-mails.
Good luck,
Dan W.
Hi Chuck,It doesn't sounds good that the Reg is getting so hot. Do any of the other chips get hot? If you have a meter, test for continuity between the output and ground, and between the supply rail and ground.
Daniel Espley
The sound from the dac is very good and no indication of any abnomality, other than the heat.
Only the 2 voltage regulators with the heat sink are hot, the other ic and regulators one are just slightly warm.One strange thing, I measure the voltage between V+/V- of the op-amp and I got around 36v, is this high?
Thanks....chuck
Hi Chuck,+/- 18V is right on the limit for most op-amps, but should be OK.
It's hard to trouble shoot by remote, so I'd suggest you get PT to sort it out.Good luck,
Daniel Espley
If it's under warranty do insist with PT. Call them if necessary, as they may not give the same attention to e-mail complaints.One thing you can do that shoudn't invalidate the warranty is increase the heatsinking. Get a flat piece of aluminum and clip it (yes, with a thick paper clip!) to the chip's heatsink.
In any case, if the chip is a 78M05 (looks like a small signal transistor?) it should be changed to a better type. What I describe above is only valid if the regulator is flat, not round, as the additional plate should make contact with a flat surface to heasink.
Good luck!
Carlos
My P-3A doesn't get very warm at all. The owner's manual actually recommends leaving the unit on.You should give tech support a call rather than email. Jon's answered my call promptly the two times I've called.
The P-3A that I have is quite cool to the touch, and I leave it on all the time. It's placed on Aurios, which provide for additional ventilation, but I think even with the stock feet it shouldn't be too warm. I'd call PT's tech service again.Bob
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